CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 85,662	$ 104,645
Short-term investments	76,861	77,293
Accounts receivable	213	2,159
Related party accounts receivable	55	154
Prepaid expenses and other current assets	4,118	3,896
Total current assets	166,909	188,147
Property and equipment, net	4,604	4,392
Intangible assets	1,750	1,750
Goodwill	949	949
Restricted cash	917	917
Other assets	2,753	2,973
Total assets	177,882	199,128
Current liabilities:
Accounts payable	3,700	6,596
Accrued liabilities	6,336	8,824
Deferred revenues, current portion	27,090	20,347
Total current liabilities	37,126	35,767
Deferred revenue, net of current portion	65,477	83,803
Deferred tax liability	514	513
Other long-term liabilities	978	566
Total liabilities	104,095	120,649
Commitments and contingencies (Note 10)
Stockholders' equity
Preferred stock, $0.00001 par value; 10,000,000 shares authorized and no shares issued and outstanding at March 31, 2017 and December 31, 2016.
Common stock, $0.00001 par value; 75,000,000 shares authorized; 36,718,940 and 36,490,169 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	1	1
Additional paid-in capital	258,509	254,871
Accumulated other comprehensive loss	(100)	(27)
Accumulated deficit	(184,623)	(176,366)
Total stockholders' equity	73,787	78,479
Total liabilities and stockholders' equity	$ 177,882	$ 199,128